Descriptions

The life history of the fungus involved and the control for cherry
leaf spot was studied ever a two-year period. It was found that the
disease in Oregon is caused by the same fungus described in New York by
Higgins in 1914 as Coccomyces hiemalis and which was more recently
transferred to the genus Higginsia by Nannfeldt. The best control of
the disease under Oregon conditions was obtained by the use of lime-sulfur.
Fair control of the disease was obtained by the use of proprietary
copper fungicides. Wettable sulfur sprays will produce excellent control
under warm weather conditions, but they are not satisfactory during
cool, wet weather. The recommended control, therefore, consists of
lime-sulfur, two gallons per hundred of spray solution at the "petal
fall" and "shuck fall" stages. If additional applications are made
necessary due to wet weather, it is doubtless safer to use wettable sulfur
(6 lbs. per 100 gals.) instead of lime-sulfur. Bordeaux-mixture gave
good control but tends to dwarf the fruit when applied after the leaves
are fairly well developed.